[NetLabel]: correct improper handling of non-NetLabel peer contexts

[linux-2.6-omap-h63xx.git] / net / ipv4 / inet_hashtables.c

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index ee9b5515b9aea20fb28d61be5aedc04321f20676..fb296c9a7f3fe385aeebbf5d5cc521360335fa8d 100644 (file)
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -13,7 +13,6 @@
  *      2 of the License, or (at your option) any later version.
  */
 
-#include <linux/config.h>
 #include <linux/module.h>
 #include <linux/random.h>
 #include <linux/sched.h>
@@ -125,8 +124,10 @@ EXPORT_SYMBOL(inet_listen_wlock);
  * remote address for the connection. So always assume those are both
  * wildcarded during the search since they can never be otherwise.
  */
-struct sock *__inet_lookup_listener(const struct hlist_head *head, const u32 daddr,
-                                   const unsigned short hnum, const int dif)
+static struct sock *inet_lookup_listener_slow(const struct hlist_head *head,
+                                             const u32 daddr,
+                                             const unsigned short hnum,
+                                             const int dif)
 {
        struct sock *result = NULL, *sk;
        const struct hlist_node *node;
@@ -160,6 +161,33 @@ struct sock *__inet_lookup_listener(const struct hlist_head *head, const u32 dad
        return result;
 }
 
+/* Optimize the common listener case. */
+struct sock *__inet_lookup_listener(struct inet_hashinfo *hashinfo,
+                                   const u32 daddr, const unsigned short hnum,
+                                   const int dif)
+{
+       struct sock *sk = NULL;
+       const struct hlist_head *head;
+
+       read_lock(&hashinfo->lhash_lock);
+       head = &hashinfo->listening_hash[inet_lhashfn(hnum)];
+       if (!hlist_empty(head)) {
+               const struct inet_sock *inet = inet_sk((sk = __sk_head(head)));
+
+               if (inet->num == hnum && !sk->sk_node.next &&
+                   (!inet->rcv_saddr || inet->rcv_saddr == daddr) &&
+                   (sk->sk_family == PF_INET || !ipv6_only_sock(sk)) &&
+                   !sk->sk_bound_dev_if)
+                       goto sherry_cache;
+               sk = inet_lookup_listener_slow(head, daddr, hnum, dif);
+       }
+       if (sk) {
+sherry_cache:
+               sock_hold(sk);
+       }
+       read_unlock(&hashinfo->lhash_lock);
+       return sk;
+}
 EXPORT_SYMBOL_GPL(__inet_lookup_listener);
 
 /* called with local bh disabled */